PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

490128Nut,plain,extended Washer,double

Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney · NSN 5310-00-941-9644 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-941-9644 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-941-9644. Primary manufacturer part number: 490128.
Features
  • Nut,plain,extended Washer,double — FSC 5310
  • Washer Thickness: 0.075 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN
  • Thread Direction: RIGHT-HAND
  • Nominal Thread Size: 0.375 INCHES IN
  • Thread Series: UNF
  • Thread Quantity Per Inch: 24
  • Surface Treatment: CADMIUM OVERALL
  • Thread Pitch Diameters: +0.3340 TO 0.3413 INCHES IN
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 8740 Overall construction
General Description

The Nut,plain,extended Washer,double, cataloged under National Stock Number 5310-00-941-9644, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 7 manufacturers, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-00-941-9644
Primary Part Number490128
Item NameNut,plain,extended Washer,double
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerRtx Corporation Dba Pratt & Whitney Div Pratt &whitney
StatusACTIVE
Washer Thickness0.075 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN
Thread DirectionRIGHT-HAND
Nominal Thread Size0.375 INCHES IN
Thread SeriesUNF
Thread Quantity Per Inch24
Surface TreatmentCADMIUM OVERALL
Thread Pitch Diameters+0.3340 TO 0.3413 INCHES IN
MaterialSTEEL COMP 8740 OVERALL
Washer Outside Diameter0.584 INCHES MINIMUM AND 0.604 INCHES MAXIMUM IN
Width Across Flats0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
Material Document and ClassificationAMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
Nut StyleDOUBLE HEXAGON
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
9150-00-265-940849012-8 INTERCHANGEABLE
Hydraulic Fluid,petroleum Base
Mobil Oil Corp
6625-00-669-8742490128 INTERCHANGEABLE
Scale,cathode Ray Tube
The Boeing Company Div Defense
5950-01-384-6093490128 INTERCHANGEABLE
Coil,radio Frequency
Datron World Communications, Inc.
6130-01-683-095249-0128 INTERCHANGEABLE
Power Supply
Rki Instruments, Inc. Dba Rki Instruments Inc
Cross-Reference Index
Part NumberManufacturer
490128 Esna, Llc (USA)
490128 Turbo Power & Marine System Inc Sub of United Technologies Corp (USA)
490128 Now Corp Modern Mfg Div (USA)
490128 Sps Technologies, Llc Dba PB Fasteners (USA)
490128 PRIMARY Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA)
490128 Harvard Industries Inc (USA)
490128 Howmet Global Fastening Systems Inc (USA)
Related Parts
9150-00-265-9408INTERCHANGEABLE
HYDRAULIC FLUID,PETROLEUM BASE
49012-8
6625-00-669-8742INTERCHANGEABLE
SCALE,CATHODE RAY TUBE
490128
5950-01-384-6093INTERCHANGEABLE
COIL,RADIO FREQUENCY
490128
6130-01-683-0952INTERCHANGEABLE
POWER SUPPLY
49-0128

Frequently Asked Questions

What is NSN 5310-00-941-9644?

NSN 5310-00-941-9644 is a Nut,plain,extended Washer,double, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-00-941-9644?

NSN 5310-00-941-9644 has 7 cross-referenced part numbers: 490128 (Esna, Llc), 490128 (Turbo Power & Marine System Inc Sub of United Technologies Corp), 490128 (Now Corp Modern Mfg Div), 490128 (Sps Technologies, Llc Dba PB Fasteners), 490128 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney) and 2 more.

What NSN replaces 5310-00-941-9644?

There are 4 known substitutes for 5310-00-941-9644: 9150-00-265-9408, 6625-00-669-8742, 5950-01-384-6093 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 490128?

Key specifications for 490128: Washer Thickness: 0.075 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN; Overall Height: 0.454 INCHES MINIMUM AND 0.474 INCHES MAXIMUM IN; Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.375 INCHES IN. 13 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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